ML19210A179
| ML19210A179 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/05/1975 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-1481, NUDOCS 7910240902 | |
| Download: ML19210A179 (4) | |
Text
1 NRC DIST: ;UTION FOR PART 50 DOCKE F M.
ERIAL (TEMPORARY FORM)
I CONTROL NO:
"Oh FILE: INCIDE!.T REPonT 9:
FROM: Metropolitan Edison Co.
DATE OF DOC DATE REC'D LTR TWX RPT OTHER Reading, Pennsylvania R.C. /,rnali o-5 75 o o 75
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SENT LOCAL PDR m
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'UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
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1 50-289 DESCRIPTION:
ENCLOSURES:
Abnormal Cecurrence 4 75-29, en 8-27-75 Concerning Failure of an Engineered Safeguards operated Reactor Building Centainment Isolation Valve (AH V-ID) to close fully.........
(1 Copy Enclosure Received)
PLANT NAME: Three Mile Island y 2 FOR ACTION /INFORMATION SA3 9-10-75 BUTLER (L)
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KNIGHTON (E)
SPELS W/ Copies W/ Copies W/ Copics W/ Copies KNIE L (L)
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SALTZMAN GOSSICK/ STAFF KNIGHT KASTNER E. GOULBOURNE (L)
MELTZ CASE PAWLICKl BALLARD P. KREUTZER (E) f GIAMBUSSO SHAO SPANG LE R J. LEE (L)
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September 5, 1975 C
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Director
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Division of Reactor Licensing c4
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,g Docket No. 50-289 Operating License No. DPR-50 In accordance with the Technical Specifications of our Three Mile Island Nuclear Station Unit 1 (TMI-1), ve are reporting the following abnor=al occurrence.
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(1)
Report Nu=ber: A0 50-289/75-29 f
(2a) Report Date: Septe=ber 5,1975 p
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(2b) Occurrence Date: August 27, 1975 5
(3)
Facility: Three Mile Island Nuclear Station Unit y
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(h)
Identification of Occurrence:
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Title:
Failure of an Engineered Safeguards operated ReactorE
~1 ding Contain=ent Isolation Valve (AH-V-lD) to close fully.
Type:
An abnor=al occurrence as defined by the Technical Specifications,
paragraph 1.8d, in that failure of contain=ent isolation valve AH-V-1D to close fuly constituted a failure of one ec=ponent of an engineered safety feature that threatened to cause the feature to be incapable of performing its intended function.
(5)
Conditions Prior to Occurrence:
Power:
Core: 98%
Elect.: 825 MWe (Gross) 6 RC Flev: 139 x 10 lb/hr 1476
\\10 RC Press.: 2155 psig RC Te=p.:
579 F PRZR Level: 2h5 inches
- 9
PRZR Temp.: 655 F (6) Description of Occurrence:
On August 27,1975, at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> while placing various co=ponents in the required pretest position for a periodic Engineered Safeguards test, the valve position indication for Reactor Building Purge Supply Valve AH-V-1D indicated that the valve was not fully closed.
The operator attempted to open the valve, which is the required pretest position, but the valve did not fully open. The operator then closed the valve by use of the close pushbutton and the valve fully closed.
It should be noted on August 26, 1975, a Reactor Building Purge was terminated at approximately 20h5 hours. At this time the AH-V-lD valve position indication showed that the valve was not fully closed. Valve position folleving purge termination was physically verified by an operator who erroneousTJ judged that AH-V-1D was fully closed.
I==ediately the in-series Reactor Building Purge Supply Valve (AH-V-lC) was verified as closed and tested to insure operability.
(7) Designation of Apparent Cause of Occurrence:
The operating cylinders on the "Robotar=" actuator were found to have corrosion on the internal surfaces. There has been no periodic lubrication of the cylinders and the air supply to the valve is not supplied with an oiler.
Binding of the cylinders due to corrosion and inadequate lubrication is considered to have caused the failure of the valve to close fully.
(8) Analyais of Occurrence:
The in-series (redundant) valve (AH-4-1C) vas verified operable and in the proper position. Contain=ent integrity was maintained. Therefore, there was no potential threat to the health and safety of the public as a result of this occirrence.
(9) Corrective Actions:
In addition to previously =entioned corrective actions, ic=ediate corrective actions were taken as follows:
a.
Lubricated the Robotar= Actuator b.
Inspected valve butterfly and seating surfaces c.
Cycled the valve full open with 110 psig nitrogen pressure d.
Re-checked valve operation with normal instrunent air supply and verified full and smooth travel consistently.
Lubricated and cycled AH-V-1A (purge exhaust valve actuator) e.
!476 i7I
Long tern corrective actions are:
The Manufacturer's representative is being consulted to obtain his a.
evaluation o'f cause for the failure and to determine corrective measures.
b.
Markings vill be placed prominently on the valve actuators to indicate when the valves are fully closed.
The Plant Operations Review Co=nittee and the Station Superintendent have reviewed and approved the above listed corrective actions and have taken steps to ensure co=pletion of the yet to be cc=pleted long tern corrective actions.
(10) Failure Data:
Pratt h8" Butterfly Valve Bettis Corporatien Robotar Actuator 80889 BK DC 107h-15R75 Si=ilar Occurrences: None Sincerely, Signed - R. C. Arnold R. C. Arnold Vice President RCA:C'dS :tas cc: Office of Inspection and Enforcement, Region 1 File:
7.7.3 5 1 20.1.1 1476 172